.. _reference-list:

#############################
Document Reference Codes
#############################

+------+-----------------------------------------------+
| CODE | Reference Number                              |
+======+===============================================+
| PO   | Purchase Order                                |
+------+-----------------------------------------------+
| IK   | Invoice Number                                |
+------+-----------------------------------------------+
| SI   | Shipper's Identification Number               |
+------+-----------------------------------------------+
| BM   | Bill of Lading Number                         |
+------+-----------------------------------------------+
| MB   | Master Bill of Lading                         |
+------+-----------------------------------------------+
| CN   | Carrier Reference Number (PRO)                |
+------+-----------------------------------------------+
| CO   | Customer Order Number                         |
+------+-----------------------------------------------+
| CR   | Customer Reference Number                     |
+------+-----------------------------------------------+
| CG   | Consignee Order Number                        |
+------+-----------------------------------------------+
| 6A   | Consignee Reference Number                    |
+------+-----------------------------------------------+
| ACL  | Application Transaction Reference Number      |
+------+-----------------------------------------------+

Source: ASC-X12 Data Element 128 - Reference Identification Qualifier.